c+windows 함 수 를 이용 하여 시간 계산 예 시 를 실현 합 니 다.

//Windows       time()，clock()，timeGetTime()，GetTickCount()，QueryPerformanceCounter()            
#include <stdio.h>
#include <windows.h>
#include <time.h>                   //time_t time()  clock_t clock()    
#include <Mmsystem.h>               //timeGetTime()    
#pragma comment(lib, "Winmm.lib")   //timeGetTime()    
//    ： Sleep()                 。
int main()
{   // time()   ，     
    time_t timeBegin, timeEnd;
    timeBegin = time(NULL);
    Sleep(1000);
    timeEnd = time(NULL);
    printf("%d
", timeEnd - timeBegin);

    // clock()   ，      
    clock_t  clockBegin, clockEnd;
    clockBegin = clock();
    Sleep(800);
    clockEnd = clock();
    printf("%d
", clockEnd - clockBegin);

    // timeGetTime()   ，      
    DWORD  dwBegin, dwEnd;
    dwBegin = timeGetTime();
    Sleep(800);
    dwEnd = timeGetTime();
    printf("%d
", dwEnd - dwBegin);

    // GetTickCount()   ，      
    DWORD  dwGTCBegin, dwGTCEnd;
    dwGTCBegin = GetTickCount();
    Sleep(800);
    dwGTCEnd = GetTickCount();
    printf("%d
", dwGTCEnd - dwGTCBegin);

    // QueryPerformanceCounter()   ，      
    LARGE_INTEGER  large_interger;
    double dff;
    __int64  c1, c2;
    QueryPerformanceFrequency(&large_interger);
    dff = large_interger.QuadPart;
    QueryPerformanceCounter(&large_interger);
    c1 = large_interger.QuadPart;
    Sleep(800);
    QueryPerformanceCounter(&large_interger);
    c2 = large_interger.QuadPart;
    printf("          %lf
", dff);
    printf("       %I64d
       %I64d
    %I64d
", c1, c2, c2 - c1);
    printf("  %lf  

", (c2 - c1) * 1000 / dff);
    return 0;
}